Attribute Revocable Attribute-Based Encryption with Forward Secrecy for Fine-Grained Access Control of Shared Data

摘要

Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is suitable for data access control on a cloud storage system. In ABE, to revoke users' attributes, it is necessary to make them unable to decrypt ciphertexts. Some CP-ABE schemes for efficient attribute revocation have been proposed. However, they have not been given formal security proof against a revoked user, that is, whether they satisfy forward secrecy has not been shown or they do not achieve fine-grained access control of shared data. We propose an attribute revocable attribute-based encryption with forward secrecy for fine-grained access control of shared data.